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Investments - Fixed Maturities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities |  | $ 74,048.4 | $ 70,781.4 |  |
Gross unrealized gains, fixed maturities |  | 700.3 | 773.6 |  |
Gross unrealized losses, fixed maturities |  | 6,479.0 | 5,877.2 |  |
Allowance, fixed maturities |  | 18.7 | 4.7 | $ 7.8 | $ 15.5
Fair value, fixed maturities | [1] | 68,251.0 | 65,673.1 |  |
Amortized cost, excluding portfolio layer method basis adjustment |  | 74,104.1 |  |  |
Gross unrealized gains, excluding portfolio layer method basis adjustment |  | 644.6 |  |  |
Gross unrealized losses, excluding portfolio layer method basis adjustment |  | 6,479.0 |  |  |
Allowance, excluding portfolio layer method basis adjustment |  | 18.7 |  |  |
Fair value, excluding portfolio layer method basis adjustment |  | 68,251.0 |  |  |
Amortized cost, unallocated portfolio layer method basis adjustment |  | (55.7) |  |  |
Gross unrealized gains, unallocated portfolio layer method basis adjustment |  | 55.7 |  |  |
Accrued interest receivable |  | 647.3 | 619.2 |  |
U.S. government and agencies |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities |  | 1,937.4 | 1,745.3 |  |
Gross unrealized gains, fixed maturities |  | 0.2 | 19.3 |  |
Gross unrealized losses, fixed maturities |  | 299.7 | 235.8 |  |
Fair value, fixed maturities |  | 1,637.9 | 1,528.8 |  |
Non-U.S. governments |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities |  | 567.3 | 550.3 |  |
Gross unrealized gains, fixed maturities |  | 12.9 | 17.3 |  |
Gross unrealized losses, fixed maturities |  | 84.5 | 59.7 |  |
Fair value, fixed maturities |  | 495.7 | 507.9 |  |
States and political subdivisions |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities |  | 7,207.8 | 7,566.4 |  |
Gross unrealized gains, fixed maturities |  | 10.4 | 44.3 |  |
Gross unrealized losses, fixed maturities |  | 1,141.7 | 933.9 |  |
Fair value, fixed maturities |  | 6,076.5 | 6,676.8 |  |
Corporate debt securities |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities |  | 38,911.1 | 38,431.3 |  |
Gross unrealized gains, fixed maturities |  | 509.9 | 578.5 |  |
Gross unrealized losses, fixed maturities |  | 3,699.9 | 3,195.2 |  |
Allowance, fixed maturities |  | 18.5 | 4.6 | 7.7 | 15.1
Fair value, fixed maturities |  | 35,702.6 | 35,810.0 |  |
Residential mortgage-backed pass-through securities |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities |  | 3,881.3 | 3,199.7 |  |
Gross unrealized gains, fixed maturities |  | 8.7 | 26.0 |  |
Gross unrealized losses, fixed maturities |  | 215.8 | 164.6 |  |
Fair value, fixed maturities |  | 3,674.2 | 3,061.1 |  |
Commercial mortgage-backed securities |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities |  | 5,634.3 | 5,428.6 |  |
Gross unrealized gains, fixed maturities |  | 4.6 | 1.2 |  |
Gross unrealized losses, fixed maturities |  | 450.9 | 654.3 |  |
Allowance, fixed maturities |  |  |  |  | 0.3
Fair value, fixed maturities |  | 5,188.0 | 4,775.5 |  |
Collateralized debt obligations |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities |  | 6,518.7 | 5,386.0 |  |
Gross unrealized gains, fixed maturities |  | 48.0 | 44.9 |  |
Gross unrealized losses, fixed maturities |  | 6.3 | 27.2 |  |
Fair value, fixed maturities |  | 6,560.4 | 5,403.7 |  |
Other debt obligations |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities |  | 9,446.2 | 8,473.8 |  |
Gross unrealized gains, fixed maturities |  | 49.9 | 42.1 |  |
Gross unrealized losses, fixed maturities |  | 580.2 | 606.5 |  |
Allowance, fixed maturities |  | 0.2 | 0.1 | $ 0.1 | $ 0.1
Fair value, fixed maturities |  | $ 8,915.7 | $ 7,909.3 |  |
[1] | See Note 4, Investments, for further details relating to the amortized cost of fixed maturities, available-for-sale.

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